Blade battery and electric device
By limiting the width ratio of the tabs to the plates and optimizing the welding area in the blade battery, the problem of small tab lead-out area is solved, improving overcurrent capacity and fast charging performance, and ensuring battery stability and safety.
Patent Information
- Authority / Receiving Office
- CN · China
- Patent Type
- Utility models(China)
- Current Assignee / Owner
- Filing Date
- 2025-04-02
- Publication Date
- 2026-03-10
AI Technical Summary
Existing blade batteries have small tab lead-out areas, limiting their overcurrent capacity and fast charging performance.
By limiting the ratio of the tab width to the electrode width to be within the range of 0.3-1, the lead-out area of the tab is increased, and the welding area and position of the tab and the electrode post are optimized. A stop frame and an insulating film are designed to ensure connection stability.
It improves the overcurrent capacity of the tabs and the fast charging performance of the battery, reduces the risk of tab tearing, and improves the overall performance of the battery.
Smart Images
Figure CN223986683U_ABST
Abstract
Description
Technical Field
[0001] This application relates to the field of battery technology, and more specifically, to a blade battery and an electrical device. Background Technology
[0002] Existing prismatic batteries have their terminals located at the top, which takes up considerable vertical space when manufacturing battery packs. Therefore, current prismatic battery technology is developing towards blade batteries, which are made into long strips with terminals located on both sides. Such batteries can significantly improve volume utilization when assembled into packs, achieving higher system mass energy density and volumetric energy density. At the same time, they simplify the complexity of the battery system, improve product stability, and reduce the failure rate.
[0003] Existing blade batteries adopt a long, flat shape design with the terminals set on the cover plate. The tabs are die-cut by the current collector and connected to the terminals. However, the lead-out area of the existing tabs is small, the current carrying capacity of the tabs is generally average, and the fast charging performance of the battery is also limited. Utility Model Content
[0004] The purpose of this application includes, for example, providing a blade battery that can improve the overcurrent capacity of the tabs and the fast charging performance of the battery.
[0005] The purpose of this application also includes, for example, providing an electrical device that can improve the overcurrent capacity of the tabs and the fast charging performance of the battery.
[0006] The embodiments of this application can be implemented as follows:
[0007] In a first aspect, embodiments of this application provide a blade battery, which includes a housing, an electrode assembly, and a cover plate. The housing has an opening, the electrode assembly is disposed inside the housing, and the cover plate is disposed on the housing to close the opening; the cover plate is provided with an electrode post.
[0008] The electrode assembly includes an electrode sheet and an electrode tab disposed on the electrode sheet. The electrode tab is welded to the electrode post. The electrode assembly satisfies: 0.3≤a2 / a1≤1.
[0009] Where a1 is the width of the electrode and a2 is the width of the tab.
[0010] Optionally, the cover plate is rectangular, and the electrode tab is provided with a rectangular pre-welding area. The length of the pre-welding area is c1 and the width is c2. The electrode assembly satisfies: c3 < b1 and 0 ≤ c4 ≤ a3.
[0011] Wherein, c3 is the distance between the edge of the pre-welded area away from the electrode and the electrode, c4 is the distance between the edge of the pre-welded area near the electrode and the electrode, b1 is the width of the cover plate, and a3 is the thickness of the electrode assembly.
[0012] Optionally, the weld mark formed by welding the tab and the post is rectangular, with a length of d1 and a width of d2, where d1 < c1 and d2 < c2.
[0013] Optionally, the end face of the pole is rectangular, and the length of the end face of the pole is b2 and the width is b3, wherein b1 > b3.
[0014] Optionally, the opening includes a first opening and a second opening opposite each other, and the cover plate includes a first cover plate and a second cover plate, wherein the first cover plate is disposed on the housing to close the first opening; and the second cover plate is disposed on the housing to close the second opening.
[0015] Optionally, a positive electrode post is provided on the first cover plate, and a negative electrode post is provided on the second cover plate; the electrode tab includes a positive electrode tab and a negative electrode tab, the positive electrode tab is welded to the positive electrode post, and the negative electrode tab is welded to the negative electrode post.
[0016] Optionally, the blade battery further includes a stop frame and an insulating film. The stop frame is disposed between the first cover plate and the electrode assembly, and the insulating film covers both the stop frame and the electrode assembly.
[0017] Optionally, the stop frame is made of injection molded material.
[0018] Optionally, the housing is made of hard metal.
[0019] Secondly, this application also provides an electrical device, including the aforementioned blade battery.
[0020] The beneficial effects of the blade battery and power device provided in this application include, for example, improving the current-carrying capacity of the tabs and the fast-charging performance of the battery. The blade battery includes a casing, an electrode assembly, and a cover plate. The casing has an opening, the electrode assembly is disposed inside the casing, and the cover plate is disposed on the casing to close the opening. A terminal post is disposed on the cover plate. The electrode assembly includes an electrode sheet and a tab disposed on the electrode sheet. The tab is welded to the terminal post. The electrode assembly satisfies: 0.3 ≤ a2 / a1 ≤ 1; where a1 is the width of the electrode sheet and a2 is the width of the tab. By limiting the ratio of the tab width to the electrode sheet width in the electrode assembly to be within the range of 0.3-1, when the ratio is within this range, the lead-out area of the tab is larger, thereby helping to improve the current-carrying capacity of the tabs and the fast-charging performance of the battery. Attached Figure Description
[0021] To more clearly illustrate the technical solutions of the embodiments of this application, the accompanying drawings used in the embodiments will be briefly introduced below. It should be understood that the following drawings only show some embodiments of this application and should not be regarded as a limitation of the scope. For those skilled in the art, other related drawings can be obtained based on these drawings without creative effort.
[0022] Figure 1 This is a schematic diagram of the blade battery in an embodiment of this application;
[0023] Figure 2 This is an exploded view of the blade battery in an embodiment of this application;
[0024] Figure 3 This is a schematic diagram of the electrode assembly in an embodiment of this application;
[0025] Figure 4 This is a schematic diagram showing the pre-welded area on the electrode tab in an embodiment of this application;
[0026] Figure 5 This is a schematic diagram of the cover plate in an embodiment of this application;
[0027] Figure 6 This is a schematic diagram illustrating the positional relationship between the solder mark and the pre-soldering area in an embodiment of this application;
[0028] Figure 7 This is a schematic diagram illustrating the state of the electrode tabs before pre-soldering in an embodiment of this application;
[0029] Figure 8 This is a schematic diagram illustrating the state of the pre-welded tabs in an embodiment of this application.
[0030] Icons: 10-Blade battery; 100-Housing; 110-Opening; 200-Electrode assembly; 210-Taper; 211-Pre-welded area; 300-Cover plate; 310-First cover plate; 320-Second cover plate; 330-Terminal post; 340-Insulating gasket; 400-Stop bracket; 500-Insulating film. Detailed Implementation
[0031] To make the objectives, technical solutions, and advantages of the embodiments of this application clearer, the technical solutions of the embodiments of this application will be clearly and completely described below with reference to the accompanying drawings. Obviously, the described embodiments are only some embodiments of this application, and not all embodiments. The components of the embodiments of this application described and shown in the accompanying drawings can generally be arranged and designed in various different configurations.
[0032] Therefore, the following detailed description of the embodiments of this application provided in the accompanying drawings is not intended to limit the scope of the claimed application, but merely to illustrate selected embodiments of the application. All other embodiments obtained by those skilled in the art based on the embodiments of this application without inventive effort are within the scope of protection of this application.
[0033] It should be noted that similar labels and letters in the following figures indicate similar items. Therefore, once an item is defined in one figure, it does not need to be further defined and explained in subsequent figures.
[0034] In the description of this application, it should be noted that if terms such as "upper," "lower," "inner," or "outer" are used to indicate the orientation or positional relationship based on the orientation or positional relationship shown in the accompanying drawings, or the orientation or positional relationship that the utility model product is usually placed in during use, they are only for the convenience of describing this application and simplifying the description, and do not indicate or imply that the device or element referred to must have a specific orientation, or be constructed and operated in a specific orientation, and therefore should not be construed as a limitation of this application.
[0035] Furthermore, the terms "first" and "second" are used only to distinguish descriptions and should not be interpreted as indicating or implying relative importance.
[0036] It should be noted that, where there is no conflict, the features in the embodiments of this application can be combined with each other.
[0037] As disclosed in the background section, existing blade batteries employ a long, flat design with terminals mounted on a cover plate. The tabs are die-cut from current collectors and connected to the terminals. However, the lead-out area of existing tabs is relatively small, affecting the battery's overcurrent capacity and limiting its fast-charging capability. Embodiments of this application provide a blade battery that at least addresses the aforementioned technical problems.
[0038] Please refer to Figures 1-3 The blade battery 10 provided in the embodiments of this application includes a housing 100, an electrode assembly 200, and a cover plate 300. The housing 100 has an opening 110. The electrode assembly 200 is disposed inside the housing 100. The cover plate 300 is disposed on the housing 100 to close the opening 110. An electrode post 330 is disposed on the cover plate 300. The electrode assembly 200 includes an electrode sheet and an electrode tab 210 disposed on the electrode sheet. The electrode tab 210 is welded to the electrode post 330. The electrode assembly 200 satisfies: 0.3≤a2 / a1≤1; where a1 is the width of the electrode sheet and a2 is the width of the electrode tab 210.
[0039] The electrode post 330 is inserted through the cover plate 300. The electrode assembly 200 is rectangular. The electrode tab 210 extends out of the electrode plate along the length of the electrode assembly 200 and is welded to the electrode post 330.
[0040] For example, a2 / a1 = 0.3, or a2 / a1 = 0.5, or a2 / a1 = 0.7, or a2 / a1 = 1.
[0041] By limiting the ratio of the width of the tab 210 to the width of the electrode in the electrode assembly 200 to be within the range of 0.3-1, the tab 210 has a larger lead-out area when the ratio of the width of the tab 210 to the width of the electrode is within this range, which helps to improve the overcurrent capacity of the tab 210 and the fast charging performance of the battery.
[0042] Please refer to Figure 4 In this embodiment, the cover plate 300 is rectangular, and the electrode tab 210 is provided with a rectangular pre-welding area 211. The length of the pre-welding area 211 is c1 and the width is c2. The electrode assembly 200 satisfies: c3 < b1 and 0 ≤ c4 ≤ a3; where c3 is the distance between the edge of the pre-welding area 211 away from the electrode and the electrode, c4 is the distance between the edge of the pre-welding area 211 close to the electrode and the electrode, b1 is the width of the cover plate 300, and a3 is the thickness of the electrode assembly 200.
[0043] The length direction of the pre-soldering area 211 is consistent with the width direction of the tab 210, and the width direction of the pre-soldering area 211 is consistent with the extension direction of the tab 210. It should be noted that the electrode assembly 200 includes a positive electrode sheet, a negative electrode sheet, and a separator. The positive electrode sheet, negative electrode sheet, and separator are formed by stacking or winding to form the electrode assembly 200. In this embodiment, the stacked form is used as an example. The thickness a3 of the electrode assembly 200 is the sum of the thicknesses of the positive electrode sheet, negative electrode sheet, and separator included in the electrode assembly 200.
[0044] By limiting the distance c3 between the edge of the pre-welding area 211 furthest from the electrode and the electrode to be less than the width b1 of the cover plate 300, the cover plate 300 can completely cover the portion of the pre-welding area 211 furthest from the electrode and between it and the electrode, so that the electrode post 330 can be welded to the electrode tab 210. The distance c4 between the edge of the pre-welding area 211 near the electrode and the electrode can be selected as 10-20mm to allow for bending of the electrode tab 210.
[0045] Please refer to Figure 5 , Figure 6 In this embodiment, the weld mark formed by welding the tab 210 and the post 330 is rectangular, with a length of d1 and a width of d2, where d1 < c1 and d2 < c2.
[0046] The length direction of the solder mark is consistent with the length direction of the pre-welding area 211, and the width direction of the solder mark is consistent with the width direction of the pre-welding area 211. The solder mark is located inside the pre-welding area 211. The length d1 of the solder mark is less than the length c1 of the pre-welding area 211, and the width d2 of the solder mark is less than the width c2 of the pre-welding area 211.
[0047] The end face of pole post 330 is rectangular, with a length of b2 and a width of b3, where b1 > b3.
[0048] The length direction of the end face of the pole post 330 is consistent with the length direction of the cover plate 300, and the width direction of the end face of the pole post 330 is consistent with the width direction of the cover plate 300. The pole post 330 is inserted inside the cover plate 300. The length of the cover plate 300 is greater than the length of the end face of the pole post 330, and the width of the cover plate 300 is greater than the width of the end face of the pole post 330.
[0049] In this embodiment, the opening 110 includes a first opening and a second opening, and the cover plate 300 includes a first cover plate 310 and a second cover plate 320. The first cover plate 310 is disposed on the housing 100 to close the first opening; the second cover plate 320 is disposed on the housing 100 to close the second opening.
[0050] The first opening and the second opening are opened opposite each other along the length of the housing 100. The first cover plate 310 and the housing 100 and the second cover plate 320 and the housing 100 are fixed by welding. When the first cover plate 310 closes the first opening and the second cover plate 320 closes the second opening, the electrode assembly 200 is encapsulated inside the housing 100.
[0051] A positive electrode post is provided on the first cover plate 310, and a negative electrode post is provided on the second cover plate 320; the electrode tab 210 includes a positive electrode tab and a negative electrode tab, the positive electrode tab is welded to the positive electrode post, and the negative electrode tab is welded to the negative electrode post.
[0052] The ratio of the width of the positive electrode tab to the width of the electrode sheet is in the range of 0.3-1, and the ratio of the width of the negative electrode tab to the width of the electrode sheet is also in the range of 0.3-1. The lead-out areas of the positive and negative electrode tabs are relatively large, the area where the positive electrode tab is welded to the positive electrode post is relatively large, and the area where the negative electrode tab is welded to the negative electrode post is relatively large, which helps to improve the overcurrent capacity of the positive and negative electrode tabs and the fast charging performance of the battery.
[0053] Both the positive and negative electrode tabs have rectangular pre-soldering areas 211. The positive electrode tab is welded to the positive electrode post to form a rectangular solder mark, which is the area where the positive electrode tab and the positive electrode post are welded, and is located inside the pre-soldering area 211. The negative electrode tab is welded to the negative electrode post to form a rectangular solder mark, which is the area where the negative electrode tab and the negative electrode post are welded, and is located inside the pre-soldering area 211.
[0054] In this embodiment, the blade battery 10 also includes a stop frame 400 and an insulating film 500. The stop frame 400 is disposed between the first cover plate 310 and the electrode assembly 200, and the insulating film 500 covers both the stop frame 400 and the electrode assembly 200.
[0055] To ensure the safety of the blade battery 10, a stop bracket 400 is provided between the first cover plate 310 and the electrode assembly 200. The stop bracket 400 has a through hole for the positive electrode tab to pass through, thereby limiting the position of the electrode tab 210 and ensuring accurate positioning during connection. After passing through the through hole, the positive electrode tab is welded to the positive electrode post. The insulating film 500 covers both the stop bracket 400 and the electrode assembly 200, thereby fixing the stop bracket 400 and the electrode assembly 200 relative to each other.
[0056] The stop bracket 400 can be made of injection molded material, which has good insulation properties and can prevent short circuits caused by contact between the positive electrode tab and the cover plate 300 or other metal parts to a certain extent. The housing 100 can be made of hard metal, for example, aluminum alloy.
[0057] In addition, a safety valve and a liquid injection hole are provided on the cover plate 300, and an insulating gasket 340 is provided on the surface of the cover plate 300 away from the electrode assembly 200.
[0058] Please combine Figure 7 , Figure 8 The manufacturing process of the blade battery 10 provided in the embodiments of this application is as follows: First, the positive and negative electrode tabs at both ends of the electrode assembly 200 are pre-welded by ultrasound. After pre-welding, the tabs 210 are gathered together towards the center in the thickness direction of the electrode assembly 200, forming a pre-welded area 211 on the gathered tabs 210. Then, the negative electrode post on the second cover plate 320 is laser-welded to the pre-welded area 211 on the negative electrode tab, forming a weld mark in the pre-welded area 211, and adhesive is applied to the weld point for insulation protection. Then, the stop bracket 400 is fitted into the side of the electrode assembly 200 away from the second cover plate 320, and an insulating film 500 is used to protect the electrode assembly 200. The electrode assembly 200 and the stop frame 400 are wrapped in a U-shape to fix the stop frame 400 relative to the electrode assembly 200. Then, the electrode assembly 200 covered with the insulating film 500 is inserted into the housing 100 through the second opening. The positive electrode post on the first cover plate 310 is laser welded to the pre-welding area 211 on the positive electrode tab, forming a weld mark in the pre-welding area 211. Adhesive insulation protection is applied at the weld point. Finally, the first cover plate 310 and the second cover plate 320 are welded to the housing 100 respectively to encapsulate the electrode assembly 200 in the housing 100 to form a battery. The welding can be performed continuously or intermittently.
[0059] The beneficial effects of the blade battery 10 provided by the embodiments of this application include at least the following: by limiting the ratio of the width of the tab 210 in the electrode assembly 200 to the width of the electrode sheet to be in the range of 0.3-1, the current carrying capacity of the tab 210 is improved compared with the existing blade battery 10, which improves the fast charging performance of the battery to a certain extent; at the same time, by limiting the position of the pre-welded area 211 and the position where the tab 210 is gathered, the tab 210 is subjected to natural force during bending, reducing the risk of the tab 210 tearing.
[0060] Embodiments of this application also provide an electrical device, including the blade battery 10 described above. For example, the electrical device can be a vehicle, ship, spacecraft, etc. Vehicles can be gasoline-powered vehicles or new energy vehicles; new energy vehicles can be pure electric vehicles, hybrid electric vehicles, or range-extended electric vehicles, etc.; spacecraft include airplanes, rockets, space shuttles, and spacecraft, etc. Embodiments of this application do not impose any special limitations on the aforementioned electrical device.
[0061] In summary, this application provides a blade battery 10 and an electrical device. The blade battery 10 includes a housing 100, an electrode assembly 200, and a cover plate 300. By limiting the ratio of the width of the tab 210 in the electrode assembly 200 to the width of the electrode sheet to be within the range of 0.3-1, when the ratio of the width of the tab 210 to the width of the electrode sheet is within this range, the lead-out area of the tab 210 is larger, which helps to improve the current carrying capacity of the tab 210 and the fast charging performance of the battery.
[0062] The above description is merely a specific embodiment of this application, but the scope of protection of this application is not limited thereto. Any variations or substitutions that can be easily conceived by those skilled in the art within the technical scope disclosed in this application should be included within the scope of protection of this application. Therefore, the scope of protection of this application should be determined by the scope of the claims.
Claims
1. A bladed battery, characterized by, The blade battery comprises a shell, an electrode assembly and a cover plate, the shell is provided with an opening, the electrode assembly is arranged in the shell, and the cover plate is arranged on the shell to close the opening; and a post is arranged on the cover plate. The electrode assembly comprises a tab and a lug arranged on the tab, the lug is welded with the post, and the electrode assembly satisfies 0.3≤a2 / a1≤1; wherein a1 is the width of the tab, and a2 is the width of the lug.
2. The bladed battery of claim 1, wherein, The cover plate is rectangular, the lug is provided with a rectangular pre-welding area, the length of the pre-welding area is c1, and the width is c2, and the electrode assembly satisfies c3<b1 and 0≤c4≤a3. Wherein, c3 is the distance between the edge of the pre-welding area away from the tab and the tab, c4 is the distance between the edge of the pre-welding area close to the tab and the tab, b1 is the width of the cover plate, and a3 is the thickness of the electrode assembly.
3. The bladed battery of claim 2, wherein, The welding mark formed by welding the lug with the post is rectangular, the length of the welding mark is d1, and the width is d2, wherein d1<c1, and d2<c2.
4. The bladed battery of claim 2, wherein, The end face of the post is rectangular, the length of the end face of the post is b2, and the width is b3, wherein b1>b3.
5. The bladed battery of claim 1, wherein, The opening comprises opposite first and second openings, the cover plate comprises first and second cover plates, the first cover plate is arranged on the shell to close the first opening, and the second cover plate is arranged on the shell to close the second opening.
6. The bladed battery of claim 5, wherein, The first cover plate is provided with a positive post, and the second cover plate is provided with a negative post; the lug comprises a positive lug and a negative lug, the positive lug is welded with the positive post, and the negative lug is welded with the negative post.
7. The bladed battery of claim 6, wherein, The blade battery further comprises a stop frame and an insulating film, the stop frame is arranged between the first cover plate and the electrode assembly, and the insulating film simultaneously covers the stop frame and the electrode assembly.
8. The bladed battery of claim 7, wherein, The stop frame is made of injection molding material.
9. The bladed battery of claim 1, wherein, The shell is made of hard metal material.
10. An electrical device, characterized by The blade battery comprises the blade battery according to any one of claims 1-9.